How can I use python to determine if a USB camera, mic, and speaker are selectable on Linux, Mac, and Windows?

[HootJeffHoot]

Goal: I am looking for a cross-platform solution to determine if the camera, mic, and speaker are enumerated and selectable. If the camera fails to enumerate while the mic and speaker do enumerate, I would like to throw an error that the camera failed to Enumerate. I am also looking for all the other permutations of a failed enumeration while keeping in mind the knowledge from one could be extracted into the other tests.

Hardware: Think of it as a phone that is plugged in via USB. The phone as mic, speaker, and camera support.

Tried: I have looked into single-platform solutions such as the following for Mac:

system_profiler SPCameraDataType | grep -i <device_string>
system_profiler SPAudioDataType | grep -i <device_string>

Issue: This is exactly what I am looking for but does not scale directly to Linux and Windows

Tried: I have also looked into the Python USB library in an attempt to find a multi-platform solution: devices = usb.core.find(idVendor=)
Issue: It seems to show the USB config file sent when a USB device is plugged in, not listing selectable endpoints. This could lead to false positives because it would not indicate a partial failure (Only audio enumeration, not video).

[mcuee]

pyusb is able to list down to device, configuration and endpoint descriptors. Please look at the turtorial.
https://github.com/pyusb/pyusb/blob/master/docs/tutorial.rst